紧凑型玉米不同肥力水平密度定额的研究

紧凑型玉米春播,在不同肥力水平的产量,低于每亩6000株定额时,随着密度的增大,均为增产的趋势.但有的增产不明显,本试验研究以掖单13号作材料,从产量性状和生理指标研究结果认为在山西晋中平川地区,中肥力最适宜的密度是每亩4600株左右,高肥力水平每亩5000株左右为宜.密度再大,穗粒数、千粒重、雌花总花数和和成粒率等影响产量的性状显著降低,败育率明显增加.密度过低,虽单株生理指标较高,但产量不及适宜密度定额的高。

STUDY ON THE POPULATION QUOTA IN DIFFERENT FERTILIZED LEVEL OF COMPACTED MAIZE

Under the population quota of 6000 plants/mu,the yield of spring sowing compacted maize in different fertil- ized level tend to increase with the population increasing,but some of them are not significant.The experiment shows: the optimum population of Yandan 13 maize is 4600 plants/mu in middle fertilized plain area,5300 plants/ mu in high fertilized area.Characters of affected yield such as grain numbers of car,1000 grains weight,total num- ber of female flower and carbcaring tiller number are apparently decrcase,failed carbearing number is more at same time,whilc the population is too high.However,the population is too thin,the yicld of maize is lower even though the physiological index is high.